Payroll Tax Guide:
Federal Payroll Taxes

Regardless of which state your employees work in, every employer in the United States is responsible for withholding and remitting federal payroll taxes. These taxes fund Social Security, Medicare, federal unemployment insurance, and the federal government’s general operations. Here’s a comprehensive overview of each federal payroll tax obligation. 

Federal Income Tax is the largest and most variable federal withholding. The amount withheld from each paycheck depends on the information the employee provides on their Form W-4, including their filing status, number of dependents, additional income, and any extra withholding they request. 

FIT uses a progressive bracket system where income is taxed at increasingly higher rates as it moves through each bracket. Employers are responsible for calculating and withholding the correct amount each pay period based on the employee’s annualized wages and W-4 elections. 

Social Security tax funds the federal retirement and disability benefits program. Both the employer and the employee contribute equally, making it a shared obligation. The tax applies to wages up to an annual wage base limit, which is adjusted each year for inflation. 

Medicare tax funds the federal health insurance program for individuals aged 65 and older and certain younger individuals with disabilities. Unlike Social Security, Medicare has no wage base limit—it applies to all wages without a cap. 

The Additional Medicare Tax of 0.9% kicks in once an employee’s wages exceed $200,000 in a calendar year. This is an employee-only obligation—the employer does not pay a matching amount. Employers are responsible for withholding this additional tax once the threshold is reached, regardless of the employee’s filing status. 

FUTA funds the federal portion of unemployment benefits and helps states administer their unemployment insurance programs. This is an employer-only tax—employees do not contribute. 

Most employers pay an effective FUTA rate of just 0.6% because they receive a 5.4% credit for paying state unemployment taxes on time. However, employers in states with outstanding federal unemployment loans (known as “credit reduction states”) may receive a reduced credit, resulting in a higher effective FUTA rate. 

As an employer, you are responsible for: calculating and withholding the correct amounts from each employee’s paycheck, making timely deposits of both the employee and employer portions to the IRS, filing quarterly returns (Form 941) and annual returns (Form 940 for FUTA), and providing employees with annual W-2 statements summarizing their earnings and withholdings. 

Failure to properly withhold, deposit, or report federal payroll taxes can result in penalties, interest charges, and potential personal liability for responsible individuals within the organization. Using a reliable payroll system like Netchex ensures these obligations are handled accurately and on time.